Abstract: An apparatus and method for detecting a tilted disc, and an apparatus and method for reproducing data from the tilted disc are provided.

Abstract: A method and an apparatus for identifying the type of an optical recording medium are provided. The method includes detecting a surface reflected signal SS and a writable-surface reflected signal SR of an optical recording medium while performing a focus search using a first optical system, counting a time difference DTS between a high peak and a low peak of the surface reflected signal SS, counting a time difference DTR between the high peak of the surface reflected signal and a high peak of the writable-surface reflected signal SR, obtaining DT by substituting DTR and DTS into the following equation: DT = ( DT R ) a ( DT S ) b ? ? ( a - b ? 1 2 ) and comparing DT with a reference time T, and driving the first optical system if DT is greater than T and driving a second optical system if DT is not greater than T.

Abstract: A method detects a disc using signals generated from a light irregularly reflected from pits formed on a recording surface of the disc. The method detects a ratio of a peak-to-peak value of a first signal generated from the irregular reflection to a peak-to-peak value of a second signal generated from the irregular reflection. The method further detects the disc according to magnitudes of the first and second signals and the detected ratio.

Abstract: A disc discrimination method and apparatus include calculating a first time difference between a time when a first focusing signal is detected from a first recording area of a first disc and a time when a first reflection signal is detected from a first surface area of the first disc, and calculating a second time difference between a time when a second focusing signal is detected from a second recording area of a second disc and a time when a second reflection signal is detected from a second surface area of the second disc. An average value of the first and the second time differences is calculated and the average value obtained as a reference time is determined and a disc type of the first disc or the second disc loaded into the optical disc system is identified using the average value.

Abstract: An apparatus and method for detecting a tilted disc, and an apparatus and method for reproducing data from the tilted disc are provided.

Abstract: An apparatus and method detecting a fashion disc, which can detect fashion discs having various shapes as well as standard discs having a diameter of 12 cm and prevent instability when reproducing the fashion discs. The method includes (a) detecting the size of an optical disc inserted in an optical disc drive by sensing the weight of the optical disc and driving the optical disc drive; (b) determining the size of the optical disc by detecting an amount of data recorded on the optical disc from a lead-in area of the optical disc; (c) if the amount of data recorded on the optical disc is below a reference value, moving a pickup to a periphery area and measuring a focus error; and (d) if the measured focus error is above a constant value, detecting the optical disc as a certain optical disc and limiting the operational speed level of the optical disc drive.

Abstract: A disc discrimination method and apparatus include calculating a first time difference between a time when a first focusing signal is detected from a first recording area of a first disc and a time when a first reflection signal is detected from a first surface area of the first disc, and calculating a second time difference between a time when a second focusing signal is detected from a second recording area of a second disc and a time when a second reflection signal is detected from a second surface area of the second disc. An average value of the first and the second time differences is calculated and the average value obtained as a reference time is determined and a disc type of the first disc or the second disc loaded into the optical disc system is identified using the average value.

Abstract: A method and an apparatus for identifying the type of an optical recording medium are provided.

Abstract: A method detects a disc using signals generated from a light irregularly reflected from pits formed on a recording surface of the disc. The method detects a ratio of a peak-to-peak value of a first signal generated from the irregular reflection to a peak-to-peak value of a second signal generated from the irregular reflection. The method further detects the disc according to magnitudes of the first and second signals and the detected ratio.